Joseph p



(No Model.)

J. P. MULLIN.

SPLIT GEAR WHEEL.

Patentecggan. 4, 1898.

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UNITED STATES PATENT EEicE.

JOSEPH P. ldULLlN, OF ARLINGTON, NEW JERSEY, ASSIGNOR OF ONE-HALF TOJAMES H. FOGARTY, OF NEXV YORK, N. Y.

SPLIT GEAR-WHEEL.

SPECIFICATION forming part of Letters Patent No. 596,784, dated January4, 1898.

Application filed November 5, 1897. Serial No. 657,568. We model.)

To ctZZ- whom may concern.-

Be it known that I, JosEPH P. MULLIN, of Arlington, in the cou nty ofHudson and'Stat-e of New Jersey, have invented a new and useful SplitGear-Wheel, of which the following is a specification.

This invention relates to the class of split or sectional gear-wheels,pulleys, (he. ,in which there is a split hub-center detachable from asplit rim and the object is to provide a hubcenter on which the sectionsof the split rim fit frictionally, so that the rim is prevented fromrotating on the center wholly by friction, means being employed,preferably a clove tail constructed at the joint, to prevent lateraldisplacement of the parts, all as will be described more in detailherein after with reference to the accompanying drawings, where- Figure1 is a side elevation of the split wheel. Fig. 2 is a diametricalsection of the samein the plane indicated by line so in Fig. 1. Fig. 3is a side view of the hubcenter, showing the sections thereof slightlyseparated. Fig. a is a fragmentary section at line {B4111 Fig. 1,showing the key f in place.

The hub-center consists of two sections 3 and .2, which when fittedtogether provide the central boss a, bored to fit on a shaft or axle,and a web Z), integral with said boss. This web is circular and has abeveled margin 0 and a dovetailed circumferential groove (1, bothconcentric with the bore in the boss. The latter has lugs h, bored toreceive securing-bolts e, for bolting the two sections y and togetherafter they are fitted on the shaft or axle. The split or line ofdivision of the hub-center does not extend straight through the samediametrically, but after dividing the boss a into two equal sections orhalves it passes obliquely through the web Z), thus throwing into one ofthe sections the angular portions marked 31 The rim of the wheel isannular and consists of two like halves or sections Y and Z, each ofwhich is furnished with a web it, having a dovetailed circumferentialgroove 0 to receive the beveled margin 0 of the web I) and a beveledcircumferential inner margin cZ on it to fit into the groove cl of thehub-center. The sections of the wheel-rim have lugs to receive bolts 6Xfor securing the rim-sections to each other, these bolts serving to drawthe sections of the rim up so tightly onto the web of the hubsectionsthat one cannot move on the other by reason of the excessive friction,the dovetail joints acting under pressure, so that no bolts are requiredor employed to secure the sections of the rim to the sections of thehub. However, as a precaution to prevent the movement of the rim aboutthe center, in case the bolts which draw together the sections of therim should become slack from any cause, a safety-key f may be employedto key the two parts together in a positive manner. This device is bestshown in Fig.

4, wherein f is the radially-arranged key driven into registeringkeyways or sockets 9, formed in the adjacent parts.

This split wheel is simple in construction and inexpensive tomanufacture. The edge 0 and groove cl may be turned after the sectionsof the hub-center have been fitted together and bored and the groove eand edge d may be turned after the sections of the rim have been fittedtogether.

It will be noted that the dovetailed inter locking devices of the rimand hub center fix the parts rigidly together when the sections of therim are fitted onto the hub-center and So drawn up with the bolts e theform and construction of the parts resulting in the inner faces of thewebs resting or pressing against each other. Thus the lateral overlapeffected by the dovetail serves to prevent lateral displacement of theparts without the aid of extraneous bolts or screws and also to draw orwedge the faces of the webs together.

The object in making the line of division of the web I) oblique, so asto throw the ex- 0 ccss at y on one of the sections of the hubcenter, isto divide the periphery of the hubcenter unequally while the rim isdivided equally, and the construction thus avoids coincidence betweenthe joints of the rim and hub-center. This feature, however, is notabsolutely essential to the invention.

Having thus described my invention, I claim* 1. A split wheel comprisinga hub-center I00 and a rim, both sectional, and respectively providedwith an interlocking peripheral edge and groove and with integral meansfor preventinglateralrmovement of one on the other, means for securingtogether the sections of the rim and means for securing together thesections of the hub-center.

2. A split wheel comprising a sectional hubcenter with a beveledperiphery or edge, a sectional rim having a circumferential groove toreceive said edge of the hub-center when the parts are fitted, wherebylateral displacement of one part or the other is prevented, meansindependent of the center for drawing and securing the sections of therim together and means independent of the rim, for securing the sectionsof the hub-center together.

3. A split wheel consisting of a hub-center of circular contour providedwith a beveled I peripheral edgeo, and a dovetail groove d, the

rim provided with a circumferential groove and peripheral edge d theselatter being adapted to fit and interlock with the edge 0 and groove 01on the hub-center, and means for securing together the sections of thehubcenter and the sections, of the rim.

4. A split wheel comprising an annular,sectional rim, and a sectionalhub-center, said rim and center having circular interlocking parts andlaterally-overlapping parts which parts and lateral overlaps, and beingheld against relative displacement, the one on the other, and asafety-key f, engaging registering keyways in the respective rim andcenter sections.

6. A split wheel comprising a sectional, an-

' nular rim and a sectional, circular hub-center on which the rimfitsand is held, one of said partshaving a circumferential groove whichreceives an edge on the other part and overlaps it at. both sides toavoid lateral displace ment, means independent of the rim whichsecurethe sections of the center together, and means independent of thecenter, which draw together the sections of the rim so that it clampsthe center tightly.

JOSEPH P. MULLIN.

